Question

What percentage of Carbon (C) is present in one molecule of
Dichlorodifluoromethane (CF2Cl2), commonly known as Freon, an anti-freezing agent
used in automobiles.
Please round everything to whole numbers for this question. Use the following
masses in your calculations:
C = 12
F = 19
Cl = 35

Answer 1

The percentage of Carbon (C) present in one molecule of

Dichlorodifluoromethane (CF₂Cl₂) : 10%

Further explanation

Proust stated the Comparative Law that compounds are formed from elements with the same Mass Comparison so that the compound has a fixed composition of elements

With this law, we can calculate how many grams an element is needed to make a compound with a certain mass, as desired

MW Dichlorodifluoromethane (CF₂Cl₂) :

=12+2.19+2.35=120 g/mol

$\tt \%mass~C=\dfrac{12}{120}\times 100\%=10\%$